Need Simple Way To Determine If File Is Executable

[Fredrik Lundh]

Sebastian 'lunar' Wiesner wrote:

> No, they aren't! Try this:

you're confusing the shell's "is this file executable" check with the 
loader's "can I execute this file" check:

$ export PATH=.:$PATH
$ dd if=/dev/zero of=ls count=1
1+0 records in
1+0 records out
$ ls -l ls
-rw-rw-r--  1 slab slab 512 Dec 20 03:33 ls
$ chmod a+x ls
$ ls
-bash: ./ls: cannot execute binary file

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